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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="css/practice2.css">
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<body>
    <div class="user">
        <h2>小明</h2>
        <section>
          <h2>张三</h2>
          <span> yahoo </span>
        </section>
        <section>
          <h1>王五</h1>
          <span>tom</span>
        </section>
      </div>
</body>
</html>